Chapter 5 Hydraulic Control Valves Tab.5-2 Configurations of spool type directional control valves Name Construction Graphic symbol Application Two- way, To connect or cut off oil paths (similar to a two- switch in function) position Three- AB way, To control flow directions (change from two- one direction to the another) position 16 Homepage List Upwards Downwards Return Exit
Chapter 5 Hydraulic Control Valves 16 Tab.5-2 Configurations of spool type directional control valves
Chapter 5 Hydraulic Control Valves Four- AB Stopping Identical oil way, ☒ To at any point retum two- Shift the 9 manner postion actuators unavailable when the Four- AB Stopping actuator way, at any point moves in the three- position 77 正☒ is available two opposte directions PT Five- AB Stopping To realize way, two- A To at any point different oil TA P B T2 Shift the 尔 retum position T PT2 unavailable actuators manner AB when the Five- actuator Stopping way. moves in the at any point three- two opposite TA P B T2 TPT2 is available posttion directions 17 Homepage List Upwards Dowrwards Return Exit
Chapter 5 Hydraulic Control Valves 17
Chapter 5 Hydraulic Control Valves 4.The operating manners for spool type directional control valves The operating manners for spool type directional control valves include:manual-operated (or mechanical- operated),solenoid-operated,pilot-operated,electro hydraulic-operated,etc.See Fig.5-4,Fig.5-5,Fig.5-6. 18 Homepage List Upwards Downwards Return Exit
Chapter 5 Hydraulic Control Valves 18 4. The operating manners for spool type directional control valves The operating manners for spool type directional control valves include: manual-operated (or mechanicaloperated), solenoid-operated, pilot-operated, electro hydraulic-operated, etc. See Fig.5-4, Fig.5-5, Fig.5-6
Chapter 5 Hydraulic Control Valves A B ☒A Play b) d) Fig.5-4 Three-position,four-way manual directional control valve a)Spring-cented spool b)Steel ball-cented spool c)Graphics symbol for Spring-cented spool d)Graphics symbol for Steel ball-cented spool 19 Homepage List Upwards Dowrward达 Return Exit
Chapter 5 Hydraulic Control Valves 19 Fig.5-4 Three-position, four-way manual directional control valve a) Spring-cented spool b) Steel ball -cented spool c) Graphics symbol for Spring-cented spool d) Graphics symbol for Steel ball -cented spool
Chapter 5 Hydraulic Control Valves P B B a) b) Fig.5-5 Two-position,two-way Solenoid-operated directional controlvalve a)Configuration b)Graphics symbol 1-Solenoid 2-Handspike 3-Valve core 4-Spring Play DVD 20 Homepage List Upwards Downwards Return Exit
Chapter 5 Hydraulic Control Valves 20 Fig. 5-5 Two-position,two-waySolenoid-operated directional control valve a) Configuration b) Graphics symbol 1-Solenoid 2-Handspike 3-Valve core 4-Spring